KR20120015913A - Light emitting diode package, and backlight and liquid crystal display device including the same - Google Patents

Light emitting diode package, and backlight and liquid crystal display device including the same Download PDF

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Publication number
KR20120015913A
KR20120015913A KR1020100078446A KR20100078446A KR20120015913A KR 20120015913 A KR20120015913 A KR 20120015913A KR 1020100078446 A KR1020100078446 A KR 1020100078446A KR 20100078446 A KR20100078446 A KR 20100078446A KR 20120015913 A KR20120015913 A KR 20120015913A
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KR
South Korea
Prior art keywords
light emitting
emitting diode
liquid crystal
constant current
current control
Prior art date
Application number
KR1020100078446A
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Korean (ko)
Inventor
양윤혁
양준혁
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020100078446A priority Critical patent/KR20120015913A/en
Publication of KR20120015913A publication Critical patent/KR20120015913A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/18—Printed circuits structurally associated with non-printed electric components
    • H05K1/182—Printed circuits structurally associated with non-printed electric components associated with components mounted in the printed circuit board, e.g. insert mounted components [IMC]

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Nonlinear Science (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention provides a liquid crystal panel for displaying an image; A plurality of light emitting diode packages mounted on a first printed circuit board, the light emitting diodes supplying light to the liquid crystal panel and a constant current control element connected to the light emitting diodes; The present invention provides a liquid crystal display including a plurality of output terminals respectively controlling the constant current control elements of the plurality of light emitting diode packages, and including a backlight driver mounted on a second printed circuit board.

Description

Light emitting diode package, and backlight and liquid crystal display device including the same}

The present invention relates to a light emitting diode package, and more particularly, to a light emitting diode package and a backlight and a liquid crystal display including the same.

As the information society develops, the demand for display devices for displaying images is increasing in various forms. Recently, liquid crystal displays (LCDs), plasma display panels (PDPs), organic fields Various flat display devices such as organic light emitting diodes (OLEDs) are being utilized.

Among these flat panel display devices, liquid crystal display devices are widely used because they have advantages of miniaturization, light weight, thinness, and low power driving. The liquid crystal display device has a backlight as a light source. The backlight supplies light to the liquid crystal panel, and the liquid crystal panel displays a desired image by modulating the supplied light.

As backlights, cold cathode fluorescent lamps (CCFLs) and external electrode fluorescent lamps (EEFLs) are widely used to date. On the other hand, light emitting diodes (LEDs) having low power consumption and high luminous efficiency have recently been adopted as backlights.

Such light emitting diodes are packaged in a package form on a so-called light emitting diode substrate so as to supply light to the liquid crystal panel. Here, the light emitting diode package includes a zener diode for protecting the electrostatic discharge (ESD) of the light emitting diode.

On the other hand, a light emitting diode driving circuit for driving a light emitting diode is mounted on a so-called driving circuit board which is separate from the light emitting diode substrate. Such a light emitting diode driving circuit includes a plurality of constant current control elements for controlling a constant current for each of the plurality of light emitting diodes.

As such, in the related art, a constant current control circuit corresponding to each of the plurality of light emitting diodes must be provided in the driving circuit board, which causes the constant current control circuit to occupy a large area of the driving circuit board. Accordingly, the space efficiency of the driving circuit board is reduced.

In addition, in the related art, a separate zener diode should be provided in the light emitting diode package, resulting in an increase in component cost.

In addition, it is true that the forward voltage of many light emitting diodes used as a backlight varies slightly due to various factors such as a manufacturing process. As a result, the power supplied to the light emitting diode also causes a deviation. That is, the power consumption of the light emitting diode package is different. However, in general, the lifespan of the entire LED package will be regarded as the same. Therefore, due to the variation in power consumption, the lifespan of the light emitting diode package is changed, which makes it difficult to guarantee the same life for the light emitting diode package. For this reason, the reliability of a light emitting diode backlight will fall.

The present invention provides a light emitting diode package capable of improving space efficiency of a driving circuit board, reducing component costs, and improving backlight reliability, and a backlight and a liquid crystal display including the same.

In order to achieve the above object, the present invention is a liquid crystal panel for displaying an image; A plurality of light emitting diode packages mounted on a first printed circuit board, the light emitting diodes supplying light to the liquid crystal panel and a constant current control element connected to the light emitting diodes; The present invention provides a liquid crystal display including a plurality of output terminals respectively controlling the constant current control elements of the plurality of light emitting diode packages, and including a backlight driver mounted on a second printed circuit board.

The constant current control device may include a bipolar transistor and may be connected to the cathode of the light emitting diode.

The apparatus may further include a flexible circuit member connecting the first and second printed circuit boards to each other.

The apparatus may further include a power supply unit which supplies a voltage to the light emitting diodes of the plurality of light emitting diode packages in common.

In another aspect, the present invention, a backlight for a liquid crystal display device, comprising a light emitting diode for supplying light to the liquid crystal panel and a constant current control element connected to the light emitting diode, a plurality of light emitting diode package mounted on a printed circuit board The constant current control device of the plurality of light emitting diode packages includes a backlight for a liquid crystal display device that is individually controlled.

The constant current control device may include a bipolar transistor and may be connected to the cathode of the light emitting diode.

In still another aspect, the present invention provides a light emitting diode package comprising: a light emitting diode; A light emitting diode package includes a constant current control device connected to the light emitting diode, and the power consumption of the light emitting diode package is controlled according to the control of the constant current control device.

The constant current control device may include a bipolar transistor and may be connected to the cathode of the light emitting diode.

In the present invention, the constant current control device is configured in the light emitting diode package. Accordingly, even if there is a forward voltage deviation between the light emitting diodes, the same voltage can be applied to the light emitting diode package as a whole so that power consumption can be set to be the same. Therefore, the lifespan of the light emitting diode package is the same as a whole, so that the reliability of the backlight using the light emitting diode can be improved.

Further, the constant current control element is not provided in the driving circuit board on which the backlight driver is mounted, but is provided in the light emitting diode package. Therefore, as compared with the related art, the space efficiency of the driving circuit board is improved.

In addition, as the constant current control device, which is a current driving device, is additionally configured in the light emitting diode package, an ESD protection effect is generated for the light emitting diode. This eliminates the need for a zener diode that has been used for conventional ESD protection. Therefore, it is possible to reduce the component cost caused by the use of the zener diode.

1 is a schematic view of a liquid crystal display device according to an embodiment of the present invention;
2 schematically illustrates a backlight and a backlight driving circuit according to an embodiment of the present invention.
3 is a schematic view of a light emitting diode package according to an embodiment of the present invention;
4 is a schematic view showing a laminated structure of a light emitting diode according to an embodiment of the present invention.
5 and 6 are cross-sectional views and plan views schematically illustrating a liquid crystal display device using a light emitting diode package according to an embodiment of the present invention, respectively.
7 is a plan view schematically illustrating an example in which two second printed circuit boards are used in a liquid crystal display according to an exemplary embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is a view schematically showing a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a view schematically showing a backlight and a backlight driving circuit according to an embodiment of the present invention, and FIG. 3 is a view of the present invention. 4 is a view schematically illustrating a light emitting diode package according to an embodiment, and FIG. 4 is a view schematically illustrating a stacked structure of a light emitting diode according to an embodiment of the present invention.

As illustrated, the liquid crystal display device 100 according to the exemplary embodiment of the present invention includes a liquid crystal panel 200, a driving circuit unit, and a light emitting diode backlight 400. The driving circuit unit includes a timing controller 300, a gate driver 310, a data driver 320, a gamma reference voltage generator 330, and a backlight driver 500.

In the liquid crystal panel 200, a plurality of gate lines GL extending in a row direction and a plurality of data lines DL extending in a column direction intersect with each other to form a plurality of pixels arranged in a matrix form. Define P).

In each pixel P, a switching transistor T connected to the gate line and the data line GL and DL is formed. The switching transistor T is connected to the pixel electrode. Meanwhile, a common electrode is formed corresponding to the pixel electrode, and an electric field is formed between the pixel electrode and the common electrode to drive the liquid crystal. The pixel electrode, the common electrode, and the liquid crystal positioned between these electrodes constitute a liquid crystal capacitor Clc. On the other hand, a storage capacitor Cst is further configured in each pixel P, which serves to store the image data voltage applied to the pixel electrode until the next frame.

The pixel P configured in the liquid crystal panel 200 may include R (red), G (green), and B (blue) pixels. Then, corresponding R, G, and B video data signals are input to each of the R, G, and B pixels P. FIG. Here, the neighboring R, G, and B pixels P constitute one video unit.

The timing controller 300 receives a data signal RGB, a control signal such as a vertical synchronization signal, a horizontal synchronization signal, a clock signal, and a data enable signal from an external system such as a TV system or a video card. Although not shown, such signals may be input to the timing controller 300 through an interface.

The timing controller 300 generates a gate control signal GCS for controlling the gate driver 310 and a data control signal DCS for controlling the data driver 320 using the input control signal.

The gate control signal GCS may include a gate start pulse, a gate shift clock, a gate output enable signal, and the like. The data control signal DCS may include a source start pulse, a source shift clock, a source output enable signal, a polarity signal, and the like.

The gamma reference voltage generator 330 divides the high potential voltage and the low potential voltage to generate a plurality of gamma reference voltages Vgamma, and supplies them to the data driver 320.

The power supply unit 340 generates and supplies various driving voltages for driving the components of the liquid crystal display device 100.

The gate driver 310 sequentially scans the plurality of gate wirings GL in units of frames in response to the gate control signal GCS supplied from the timing controller 300. During each scan period, a turn-on voltage, for example, a gate high voltage, is supplied to the gate wiring GL. On the other hand, the turn-off voltage, for example, the gate low voltage, is supplied to the gate wiring GL until the scan period of the next frame. As the turn-on voltage is applied during the scan period, the switching transistor T is turned on.

The data driver 320 supplies the image data voltages to the plurality of data wirings DL in response to the data control signal DCS supplied from the timing controller 300. For example, the data driver 320 generates a plurality of gray voltages using the input gamma reference voltages Vref. The plurality of gray voltages correspond to each of the plurality of gray levels of the image data signal RGB. Accordingly, when the image data signal RGB is input, the gray level voltage corresponding to the gray level of the video data signal RGB is selected. The gray voltage is an image data voltage and is output to the data wiring DL.

The backlight 400 serves to supply light to the liquid crystal panel 200. The backlight 400 includes a plurality of light emitting diode packages (LEDPs). In an embodiment of the present invention, the plurality of light emitting diode packages (LEDP) can be driven independently of each other.

Each of the light emitting diode packages LEDP may include a light emitting diode LED and a constant current control device CRC.

Referring to Figure 4 looks at the laminated structure of the light emitting diode (LED). The light emitting diode (LED) includes a buffer layer 23, an n-type semiconductor layer 25, an active layer 27, a p-type semiconductor layer 29, a transparent electrode 31, and an n-type metal stacked on a substrate 21. The electrode 35 and the p-type metal electrode 33 may be included. Here, the n-type metal electrode and the p-type metal electrode will correspond to the cathode (cathode) and the anode (anode), respectively.

Here, the sapphire substrate 21 may be used as the substrate 21, but is not limited thereto. The semiconductor layer and the active layers 25, 27, and 29 may be formed of a nitride-based semiconductor material, but are not limited thereto.

Meanwhile, in order to form the electrodes 33 and 35, the n-type semiconductor layer 25 may be partially etched in a stepped shape to arrange the electrodes in a top-top manner. That is, the n-type metal electrode 35 is configured at one corner of the exposed n-type semiconductor layer 25, and the p-type metal electrode 33 may be configured on the transparent electrode 31.

In the light emitting diode (LED) configured as described above, holes entering through the p-type metal electrode 33 and electrons entering through the n-type metal electrode 35 are combined in the active layer 27 to emit light.

Although not specifically illustrated, the light emitting diode package LEDP may further include a fluorescent material layer and a lens on the light emitting diode LED, that is, in a direction in which light is emitted. Light emitted from the light emitting diode (LED) is incident on the fluorescent material layer, so that light of a corresponding color is generated in the fluorescent material layer. As such, the light generated in the phosphor layer and the light emitted from the light emitting diode are mixed, and the mixed light can be emitted to the outside through the lens.

As a light emitting diode (LED) having the configuration as described above is an example, it is apparent to those skilled in the art that a light emitting diode having other configurations can be used.

As described above, one electrode of the light emitting diode LED, for example, an anode receives a driving voltage Vout. The driving voltage Vout is output from the power supply unit 340. For example, the power supply unit 340 may include a DC-DC converter 341. The DC-DC converter 341 may convert the input input voltage Vin to convert the driving voltage Vout. Will print.

Here, the driving voltage Vout output from the DC-DC converter 341 may be commonly supplied to the plurality of light emitting diode packages LEDP.

Meanwhile, the constant current control device CRC mounted in the light emitting diode package LEDP may be connected to another electrode, for example, a cathode of the light emitting diode LED. As such a constant current control device (CRC), for example, a bipolar transistor (BJT) can be used.

The collector of the constant current control device (CRC), that is, the bipolar transistor, may be connected to the cathode of the light emitting diode (LED). The emitter of the constant current control element CRC may be grounded. On the other hand, the base of the constant current control device (CRC) may be connected to the backlight driver 500.

The backlight driver 500 includes a plurality of control signal output terminals CT. Each of the plurality of control signal output terminals CT corresponds to the plurality of light emitting diode packages LEDP. That is, each of the plurality of control signal output terminals CT is connected to the constant current control element CRC configured in the plurality of light emitting diode packages LEDP. Accordingly, the plurality of constant current control elements (CRC) can be individually controlled operation. As a result, the light emitting diodes (LEDs) can be individually controlled.

The backlight driver 500 outputs a control signal to each output terminal CT, and the output control signal is transmitted to the corresponding constant current control element CRC to control the operation of the corresponding constant current control element CRC. do.

The constant current control element CRC controls the constant current supplied to the light emitting diode LED in response to the input control signal. In this regard, the constant current control element CRC functions as a variable resistor. That is, according to the adjustment of the control signal, the resistance value between the collector and the emitter is adjusted, and thus the constant current flowing through the light emitting diode (LED) can be adjusted.

As such, as the constant current control device CRC can perform a function as a variable resistor, the power applied to the light emitting diode package LEDP can be adjusted. In this regard, the forward voltages of a plurality of light emitting diodes (LEDs) used as backlights are somewhat different due to various factors such as manufacturing processes.

For example, when the normal forward voltage of the light emitting diodes (LEDs) is 3.3V, some of the light emitting diodes (LEDs) may have forward voltages such as 3.2V or 3.4V, which are out of the above-described 3.3V. .

In this case, the constant current control of the light emitting diode package LEDP to compensate for the forward voltage deviation for the light emitting diode package LEDP equipped with the light emitting diode LED having a forward voltage deviating from the normal forward voltage. The resistance value of the device CRC is adjusted.

Accordingly, even if there is a forward voltage deviation between the light emitting diodes (LEDs), the same voltage may be applied to the light emitting diode package LEDP. As a result, the power consumption of the entire LED package LEDP can be set to be the same. Therefore, the lifespan of the light emitting diode package LEDP becomes the same as a whole, so that the reliability of the backlight 400 using the light emitting diode LED may be improved.

In addition, the constant current control device (CRC) according to the embodiment of the present invention is not provided in the printed circuit board, that is, the driving circuit board on which the backlight driver 500 is mounted, but is provided in the light emitting diode package LEDP. Therefore, as compared with the related art, the space efficiency of the driving circuit board is improved.

In addition, as the constant current control device CRC, which is a current driving device, is additionally configured in the light emitting diode package LEDP, an ESD protection effect is generated on the light emitting diode LED. This eliminates the need for a zener diode that has been used for conventional ESD protection. Therefore, it is possible to reduce the component cost caused by the use of the zener diode.

On the other hand, the above-described backlight driver 500 may be composed of at least one n-channel driving circuit. For example, the n-channel driving circuit has n output terminals CT connected to each of the n light emitting diode packages LEDP and individually driven. Accordingly, when k n-channel driving circuits are used, k * n light emitting diode packages LEDP can be driven.

5 and 6 are cross-sectional views and plan views schematically illustrating a liquid crystal display device using a light emitting diode package according to an embodiment of the present invention, respectively.

5 and 6, the liquid crystal panel 200 includes first and second substrates 210 and 220 facing each other, and a liquid crystal layer (not shown) positioned between the first and second substrates 210 and 220. It may include.

Below the liquid crystal panel 200, a light emitting diode substrate, that is, a first printed circuit board PCB1, which is a printed circuit board on which a light emitting diode package LEDP disposed in a matrix form is mounted, is positioned.

Between the liquid crystal panel 200 and the first printed circuit board PCB1, a plurality of optical sheets 600, for example, a diffusion sheet and a prism sheet may be positioned.

Meanwhile, at least one side of the first printed circuit board PCB1 may be a printed circuit board on which the backlight driver (see 500 in FIG. 2) is mounted, for example, a second printed circuit board PCB2.

The second printed circuit board PCB2 may be connected to the first printed circuit board PCB1 through at least one flexible circuit member FCM. Here, the flexible circuit member FCM has a flexible characteristic and is an electrical connection member having a plurality of wiring patterns. For example, a flexible circuit film, a flexible cable, or the like may be used.

In this case, in order to transmit the control signal output from the backlight driver mounted on the second printed circuit board PCB2 to the light emitting diode package LEDP, the backlight driver and the LED package LEDP are transferred to the transfer wiring TL. Can be connected via. The transfer wiring TL is formed of a second printed circuit board PCB2, a flexible circuit member FCM, and a wiring pattern formed on the first printed circuit board PCB1, and includes a backlight driver and a light emitting diode package. LEDP) is electrically connected.

On the other hand, the transfer wiring for transmitting the driving voltage (Vout) and the connection wiring for the ground may also be formed on the first printed circuit board (PCB1), flexible circuit member (FCM) and the second printed circuit board (PCB2).

The above-described second printed circuit board PCB2 is formed of the first printed circuit board PCB1 due to the bending of the flexible circuit member FCM in the process of joining a plurality of electrical mechanical components constituting the liquid crystal display device. It may be located on the back side.

7 is a plan view schematically illustrating an example in which two second printed circuit boards are used in a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the light emitting diode package LEDP is mounted on the first printed circuit board PCB1. Meanwhile, two second printed circuit boards PCB2_L and PCB2_R are positioned at both sides of the first printed circuit board PCB1, and the backlight driver (500 of FIG. 2) is located at each of the two second printed circuit boards PCB2_L and PCB2_R. ) May be mounted.

In this case, a part of the light emitting diode package LEDP is driven corresponding to the second printed circuit board PCB2_L located on the left side, and the other part is driven corresponding to the second printed circuit board PCB2_R located on the right side. Can be. For example, the light emitting diode package LEDP positioned on the left side of the first printed circuit board PCB1 based on the center line in the vertical direction is connected to the second printed circuit board PCB2_L on the left side and driven. The light emitting diode package LEDP positioned on the right side may be connected to and driven with the second printed circuit board PCB_R positioned on the right side. As another example, the light emitting diode package (LEDP) positioned above the center line of the first printed circuit board PCB1 in the horizontal direction may be one of the left and right second printed circuit boards PCB2_L and PCB2_R. The light emitting diode package LEDP positioned at the lower side may be connected to the other one of the left and right second printed circuit boards PCB2_L and PCB2_R. On the other hand, in various forms different from the above examples, it will be apparent to those skilled in the art that the plurality of light emitting diode packages LEDP can be driven by being connected to two second printed circuit boards LED2_L and LED2_R.

In the above-described embodiment of the present invention, the direct type backlight in which the backlight is positioned below the liquid crystal panel has been mainly described. Alternatively, an edge type backlight in which the backlight is located on the side of the liquid crystal panel may be used. In relation to such an edge type backlight, the light guide plate is positioned under the optical sheet, and the light emitting diode package is arranged along the light incident surface which is one side of the light guide plate.

As described above, in the embodiment of the present invention, the constant current control element is configured in the light emitting diode package. Accordingly, even if there is a forward voltage deviation between the light emitting diodes, the same voltage can be applied to the light emitting diode package as a whole so that power consumption can be set to be the same. Therefore, the lifespan of the light emitting diode package is the same as a whole, so that the reliability of the backlight using the light emitting diode can be improved.

Further, the constant current control element is not provided in the driving circuit board on which the backlight driver is mounted, but is provided in the light emitting diode package. Therefore, as compared with the related art, the space efficiency of the driving circuit board is improved.

In addition, as the constant current control device, which is a current driving device, is additionally configured in the light emitting diode package, an ESD protection effect is generated for the light emitting diode. This eliminates the need for a zener diode that has been used for conventional ESD protection. Therefore, it is possible to reduce the component cost caused by the use of the zener diode.

Embodiment of the present invention described above is an example of the present invention, it is possible to change freely within the scope included in the spirit of the present invention. Accordingly, the invention includes modifications of the invention within the scope of the appended claims and their equivalents.

LEDP: Light Emitting Diode Package LED: Light Emitting Diode
CRC: constant current control element

Claims (8)

A liquid crystal panel displaying an image;
A plurality of light emitting diode packages mounted on a first printed circuit board, the light emitting diodes supplying light to the liquid crystal panel and a constant current control element connected to the light emitting diodes;
And a plurality of output terminals respectively controlling the constant current control elements of the plurality of light emitting diode packages, the backlight driver being mounted on a second printed circuit board.
And the liquid crystal display device.
The method of claim 1,
The constant current control device includes a bipolar transistor and is connected to the cathode of the light emitting diode.
LCD display device.
The method of claim 1,
And a flexible circuit member connecting the first and second printed circuit boards to each other.
The method of claim 1,
And a power supply unit which supplies a voltage to the light emitting diodes of the plurality of light emitting diode packages in common.
In the backlight for a liquid crystal display device,
It includes a light emitting diode for supplying light to the liquid crystal panel and a constant current control device connected to the light emitting diode, and includes a plurality of light emitting diode package mounted on a printed circuit board,
The constant current control elements of the plurality of light emitting diode packages are individually controlled.
Backlight for liquid crystal display.
The method of claim 5, wherein
The constant current control device includes a bipolar transistor and is connected to the cathode of the light emitting diode.
Backlight for liquid crystal display.
In the light emitting diode package,
A light emitting diode;
It includes a constant current control device connected to the light emitting diode,
According to the control of the constant current control device, the power consumption of the light emitting diode package is adjusted
LED package.
The method of claim 7, wherein
The constant current control device includes a bipolar transistor and is connected to the cathode of the light emitting diode.
LED package.
KR1020100078446A 2010-08-13 2010-08-13 Light emitting diode package, and backlight and liquid crystal display device including the same KR20120015913A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100078446A KR20120015913A (en) 2010-08-13 2010-08-13 Light emitting diode package, and backlight and liquid crystal display device including the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100078446A KR20120015913A (en) 2010-08-13 2010-08-13 Light emitting diode package, and backlight and liquid crystal display device including the same

Publications (1)

Publication Number Publication Date
KR20120015913A true KR20120015913A (en) 2012-02-22

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